Own the 1964Ts, have heard the JH5s. And I think the JH5s are what you want, the 1964s are pretty much ruler flat with regards to frequency response. Going by the V-shape you mentioned I believe the JH5s would suit your taste slightly more than what I believe to be the rather analytical soundsig of the 1964-T. And the soundstage is not too good (although spacing and placing is excellent), JH does it slightly better. (Not as excellently as you would like though, that is slightly unrealistic with any IEM)

OP, if you go with JH, they will probably recommend an audiologist who will have you use a bite block (UE did at the Bay Area meet) and 1964-Ears sends along a sheet for audiologists on the way to get the best impression. There's an recommended audiologist thread on here somewhere that may be worth checking out to see if there's anyone from Sweden who has a recommendation.

I will have the first review of a new custom, the Thousand Sound TS842 which uses a dynamic low end driver and the ER4 driver for the mids/highs. So far it is performing quite nicely for the $515 price (plus shipping and impressions). I don't have the JH5 for comparison, but will have some other customs in the same price range in the near future (Minerva Mi-3 & DRM Earz DRM-4X) and there are many other lower cost items. Please check out my thread (and bump it if you like it ;)): http://www.head-fi.org/forum/thread/541494/customs-resource-thread-summary-reviews-info-manufacturers